Инструкция на Внутренние блоки мини-VRF MDV серии Atom V8 бренда MDV

R410A/R32

7) Commercial Air Conditioners Service Manual V8 Atom VRF Indoor Units

Indoor and outdoor unit compatibility Before performing maintenance, please confirm that the indoor and outdoor units in the system are compatible with each other. For specific compatibility relationships, please refer to the table below. Indoor Unit V6 platform 2nd 2nd generation generation AC DC…

R32 System Service Indoor units in this manual can be used with both R410A and R32 refrigerant systems. When repairing systems that use R32 refrigerant, the following warnings and operating requirements should be noted. 2.1 Warning about the R32 refrigerant The following information indicates a…

The following checks shall be applied to installations using flammable refrigerants

– the charge size is in accordance with the room size within which the refrigerant containing parts are installed; – the ventilation machinery and outlets are operating adequately and are not obstructed; – if an indirect refrigerating circuit is being used, the secondary circuit shall be checked for…

Since flammability is a consideration. The following procedure shall be adhered to

• remove refrigerant; • purge the circuit with inert gas; • evacuate; • purge again with inert gas; • open the circuit by cutting or brazing. The refrigerant charge shall be recovered into the correct recovery cylinders. The system shall be “flushed” with OFN to render the unit safe. This process…

When transferring refrigerant into cylinders, ensure that only appropriate refrigerant recovery cylinders are employed. Ensure that the correct number of cylinders for holding the total system charge are available. All cylinders to be used are designated for the recovered refrigerant and labelled…

Notes

1. Standard: The port is standard, the customers can connect corresponding device through this port, such as water pump and Humidity sensor etc. Customized: The port is not available on the mainboard. If necessary, you need to customize the port Reserved: This port can not be used. 2. When…

Table 3.2: voltage test instructions (continue)

Code Content CN190 Drainage pump port Description Description When the water pump is running, pin 2 and 3 output 12V DC 1 pin CN30 Display panel Using the DC voltage gear of the multimeter connection to test pin 1 and 4, the value should be 12V; GND GND-L 1 pin Using the DC voltage gear of the…

3.2 Duct

Figure 3.2: 05~24 model Duct main PCB ports MDV V8 Atom Series VRF Indoor Units Table 3.3: 05~24 model Duct main PCB ports Label in Figure 3.3 Code CN1(L.N) CN22 (ALARM,N,AC2) CN12(H-L) CN29(H-N) CN100 Content Port voltage Note AC power input 220V AC Standard 220V AC Standard Reserved 220V AC…

Table 3.3: 05~24 model Duct main PCB ports (continued)

Label in Code Content 7 CN81 T2 Temperature sensor connection 3.3V DC Standard 8 CN82 T1 Ambient Temperature sensor connection 3.3V DC Standard 9 CN83 T2B Temperature sensor connection 3.3V DC Standard 10 CN-A Sterilization module port 12V DC Standard 11 CN30 Display Panel connection 12V DC[5]…

Figure 3.3: 28~40 model Duct main PCB ports

MDV V8 Atom Series VRF Indoor Units Table 3.5: 28~40 model Duct main PCB ports Label in Figure 3.4 Code CN1(L.N) CN22 (ALARM,N,AC2) CN12(H-L) CN29(H-N) CN100 Content Port voltage Note AC power input 220V AC Standard 220V AC Standard Reserved 220V AC Reserved Power supply for fan motor Actual voltage…

Table 3.5: 28~40 model Duct main PCB ports (continued)

Label in Code Content Port voltage Note 7 CN81 T2 Temperature sensor connection 3.3V DC Standard 8 CN82 T1 Ambient Temperature sensor connection 3.3V DC Standard 9 CN83 T2B Temperature sensor connection 3.3V DC Standard 10 CN-A Sterilization module port 12V DC Standard 11 CN30 Display Panel…

3.3 Wall Mounted

Notes

1. Standard: The port is standard, the customers can connect corresponding device through this port, such as water pump and Humidity sensor etc. Customized: The port is not available on the mainboard. If necessary, you need to customize the port Reserved: This port can not be used. 2. When…

4 Indoor unit settings

MDV V8 Atom Series VRF Indoor Units 4.1 Parameter settings Taking KJR-86S/BK as an example, the parameters can be set in the power-on or power-off state. ①Hold " " and " " for 3 seconds to enter the parameter setting interface, and the main interface will display "CC" ② Spot check a) Wired…

Table 4.1: Wired controller Parameter Settings(continues)

Parameter Code C06 Parameter Name Parameter Range LED indicator of wired 00: Off controller 01: On Wired controller Follow C07 Me temperature -5.0 to 5.0°C correction C08 C09 C10 C11 C12 C15 temperature Upper limit of cooling temperature Lower limit of heating temperature Upper limit of heating…

Table 4.2: Indoor unit Parameter Settings

Parameter Code Parameter Name Parameter Range Default Value Remarks IDU static pressure level: N00 Static pressure of IDU 00/01/02/03/ The IDU sets the selected corresponding static pressure FF 04/05/06/07/08/ (FF-there may be different default values for different series of indoor units) 09/~/19/FF…

Parameter

Code Parameter Name Parameter Range Default Value Remarks 00: Start/Stop delay 01: Speed 1 02: Speed 2 03: Speed 3 N18 Fan speed setting in 00/01/02/03/04/ Cooling standby mode 05/06/07/14 01 04: Speed 4 05: Speed 5 06: Speed 6 07: Speed 7 14: Fan speed before going to standby mode 00: Fan off N19…

Parameter

Code Parameter Name Parameter Range Default Value Remarks 00: 0°C IDU cooling mode N26 temperature 01: 1°C 00/01/02/03/04 00 compensation 02: 2°C 03: 3°C 04: -1°C 00: 03°C Maximum indoor N27 temperature drop in dry 01: 04°C 00/01/02/03/04 01 mode 02: 05°C 03: 06°C 04: 07°C N30 Constant air flow…

Parameter

Code N40 Parameter Name Long-distance alarm function setting Parameter Range Default Value 00/01 00 N41 Turbo 00/01 00 N42 Sterilization function 00/01 00 Remarks 00: Alarm when closed 01: Alarm when open 00: Off 01: On (Rapid cooling/Rapid heating) 00: No sterilization function (default) 01: Plasma…

Parameter

Code Parameter Name Parameter Range Default Value Remarks 00: 15 min 01: 30 min N53 Stop delay when 00/01/02/03/04/ unattended 05 01 02: 45 min 03: 60 min 04: 90 min 05: 120 min N54 N55 MDV V8 Atom Series VRF Indoor Units N56 MDV ETA function setting Energy rating of cooling MDV ETA Energy rating of…

4.2 Indoor unit parameter query

Taking KJR-86S/BK as an example ①Hold " " and " " for 2 seconds to enter the query interface, "u00-u03" indicates ODUs, "n00-n63" indicates IDUs (the last two digits are the ODU or IDU addresses), and "CC" indicates the wired controller . Press " " and " " to switch the IDU code (For example n02)…

4.3 Function Descriptions

MDV V8 Atom Series VRF Indoor Units 4.3.1 Power failure memory function The power failure memory function can be used to ensure that, in the event of a power outage, the indoor units, which was in operation before, automatically restart once the power returns. When the power returns following a…

Display Panels 5.1 Appearance of Display Panel The appearance of the digital display panel used is shown in Figure 5.1. Figure 5.1: Digital display panel1 Display panel for Compact Four-way Cassette LED display Display panel for Duct (Optional) LED display Troubleshooting Guide Display panel for…

5.2 Output under Normal Operating Conditions

Unit state Digital display Standby Cooling and heating : set temperature Normal operation Operating Fan only mode: indoor ambient temperature Special operation1 Mode code Error2 Error code MDV V8 Atom Series VRF Indoor Units Notes: 1. The special operation modes refer to Table 7.2:Operating Status…

Control 6.1 Temperature Compensation Control Because of the installation position of Indoor Unit and different layout, indoor temperature detected by Indoor Unit may not consist with actual temperature. Indoor temperature could be compensated by controller (The parameter code is”N25” “N26”) 6.2 EEV…

6.3 Start and Stop Control

Indoor Unit judges the operation state according to the temperature compensation value (ΔTC) and the difference value between detected indoor temperature (T1) and set temperature (TS). When the indoor temperature reaches the set one, Indoor Unit shut down; when the indoor temperature exceeds the set…

6.4 Fan Control

6.4.1 Fan speeds control The IDU can work in seven-speeds or three-speeds. �� Seven-speeds When the Indoor Unit detects seven wind speeds the wind speed is set as follows. Sleep Speed 1 Speed 2 Speed 3 Speed 4 Speed 5 Speed 6 Speed 7 Auto  Three-speeds When the Indoor Unit detects only three wind…

�� Determine the initial fan speed of auto fan control

The initial fan speed is determined according to the difference between ambient indoor temperature (T1) and set temperature (TS), and it updates in the following situations: 1) The first time enter this mode 2) TS is changed 3) When switching between normal operation and silent operation 6.4.3…

6.5 Swing control

6.5.1 Horizontal swing control �� Angle range of horizontal swing Table 6.1: Angle range of horizontal swing heating cooling adjustable range A1+A2 A1+A2 shutdown angle A1+B/A2+C A1+B/A2+C Figure 6.1 Horizontal swing angle Troubleshooting Guide Note: Wall mounted(G) have Horizontal swing control…

6.5.2 Vertical swing control

Figure 6.2 Vertical swing control Different IDU series have different adjustable swing angle and default swing angle under different functions. And each operation mode has its default adjustable range of swing angle. P1-P5 values vary because of the different operation modes and IDU series. For…

Table 6.5: Digital tube display instructions

Louver Digital tube 1 Digital tube 2 Digital tube 3 Louver 1 A flash A flash A flash Louver 2 E/F flash - - Louver 3 D flash D flash D flash Louver 4 - - B/C flash A/D/E/F flash A/D flash A/B/C/D flash Louver 1+2+3+4 Note: If there are more than 2 louvers are set to close, only the first and second…

6.6 Operation mode control

�� Outdoor Unit is Heat Pump ①When the mode is set by ODU to VIP priority, Voting priority, Capability requirements priority, Cooling priority, heating priority, the Indoor Unit can be set to cooling, heating, dehumidification, ventilation modes. When the IDU set mode different from the mode of ODU…

6.7 Human Detect control

The Human detect sensor is optional. The operation mode of human detect control can be set by controller (N50). 1） When set the mode "Used to adjust the set temperature when unattended" and enter the unattended state1, the following logic is executed ① When the cooling/automatic cooling mode…

6.8 Controlling the Condensate Water Pump and Water Level Switch

1) 2) 3) When the IDU is powered on the first time, the water pump is forced to operate for 5 minutes. When the IDU and ODU are in cooling, dehumidification and self-cleaning mode, the water pump starts immediately and operates continuously. After this mode is stopped (stop or mode switch), the…

6.11 High ceiling setting

For embedded IDU series, such as Compact Four-way Cassette, when the installation exceeds the specified height (default 3 meters), can enter the High ceiling setting ( The parameter code is”N31” ) to change . 3 meters high height, 4 meters high height or 4.5 meters high height can be set. When the…

6.13 Dry mode control

There is a difference between the control with humidity sensor and the control without humidity sensor, when the humidity sensor is damaged, the indoor unit automatically switches to the state without humidity sensor. �� Without humidity sensor Related settings: ①The temperature of dry mode;②Maximum…

Errors and operation code 7.1 Error Code Table Table 7.1: Error code Error Content code Error A01 Emergency stop C52 A11 R32 refrigerant leaks, requiring shutdown immediately C61 A51 Outdoor unit fault C71 A71 A72 A73 A74 The fault of the linked FAPU is transmitted to the master IDU (series setting)…

Table 7.1: Error code(continues)

Error Content code E31 E32 E33 E61 E62 MDV V8 Atom Series VRF Indoor Units E81 The built-in room temperature sensor of the wired controller short-circuits or cuts off The wireless temperature sensor short-circuits or cuts off The external room temperature sensor short-circuits or cuts off Tcp…

Troubleshooting Warning ��All electrical work must be carried out by competent and suitably qualified, certified and accredited professionals and in accordance with all applicable legislation (all national, local and other laws, standards, codes, rules, regulations and other legislation that apply…

8.1.1 A01 – Emergency shutdown

Digital display Display position Error display Panel, display box, and wired controller The faulty IDU and other IDUs of the same system: stop running, displaying code "A01" (V6 platform indoor Error impact unit displays "A0" code) ODU of the same system: stop running, displaying code "A01" (V6…

8.1.2 A11 - R32 refrigerant leaks, requiring shutdown immediately

Digital display Display position Error display Panel, display box, and wired controller �� Faulty IDU: The fan operates at the highest speed, the EEV is closed (Note: Fault persists after power on again), and buzzer of the display control board of the faulty IDU and buzzer of wired controller…

Note 1

Step 1: Check whether pipes are leaking refrigerant. Method: If the system is connected with the refrigerant cutoff device, use the refrigerant pressure gauge to connect the check valve of refrigerant cut-off device liquid or gas pipe; If the system is not connected with a refrigerant cut-off…

Figure 1 Schematic diagram of the R32 refrigerant leakage detection system

1-1: Common terminal 2-2: Sending R32 refrigerant leakage signal 3-3: Sending sensor module fault signal Connecting an alarm or a fan 1-1/2-2/3-3 three-core communication cable (configured on site) AC220V output S1 button Buzzer Adapter board Ten-core communication cable (configured by factory) UART…

8.1.3 A51 - ODU fault

Digital display Display position Error display Panel, display box, and wired controller The faulty IDU and other IDUs of the same system: The fan continues running, the EEV is closed, and code "A51" is displayed (V6 platform IDU displays the code "Ed") Error impact ODU of the same system: �� stops.…

8.1.4 A71 - The error of the linked FAPU is transmitted to the master IDU (series setting)

Note: 1) The type of FAPU may be HRV, VRF fresh air IDU and so on. 2) Series setting: The air supply side of the linked FAPU is directly connected to the air return side of the master IDU through an air duct. A wired controller is used to set this installation method as a series connection. Digital…

8.1.5 A72 - The error of the linked humidifying IDU is transmitted to the master IDU

Digital display Error display Display position (master IDU) Panel or display box Wired controller Spot check interface Error code is not query displayed Master IDU: operates normally. Humidifying IDUs: stop. Other IDUs of the same system: operate Error impact normally. ODU of the same system…

8.1.6 A73 - The error of the linked FAPU is transmitted to the master IDU (non-series connection)

Note: 1) The type of FAPU may be HRV, VRF fresh air IDU and so on. 2) Series setting: The linked FAPU and the master IDU are connected to the air supply duct and air return duct respectively and separately. A wired controller is used to set this installation method as a non-series connection.…

8.1.7 A74 - The error of the AHU Kit slave unit is sent to the master unit

Note: When multiple AHU Kits are connected in parallel, the master AHU Kit (referred to as the master) communicates with the ODU, and the slave AHU Kit (referred to as the slave) communicates with the master unit. When the slave fails, the slave unit sends a fault signal to the master unit, and the…

8.1.8 A81 - Self-check fault

Digital display Display position Error display Panel, display box, and wired controller Faulty IDU: stops. Other IDUs of the same system: �� IDUs that share the same MS with the faulty IDU will stop operating, while other IDUs remain in operation. �� IDUs that share the same MS with the faulty IDU…

8.1.9 A82 - MS (refrigerant flow direction switching device) fault

Digital display Display position Faulty IDU Panel, display box, and wired controller Faulty IDU: The fan continues running, and the EEV is closed. Other IDUs of the same system: �� IDUs that share the same MS with the faulty IDU: The fan continues running, and the EEV is closed. Other IDUs remain in…

8.1.10 A91 - Mode conflict (V6 communication protocol adopted)

Available when using V6 platform wired controller. Digital display Display position Panel, display box, and wired controller Error display (Note: Error codes are displayed 2 minutes after faults are triggered) Faulty IDU: The fan continues running, and the EEV is closed. Other IDUs of the same…

8.1.11 b11, b13 - Error in 1# electronic expansion valve coil, error in 2# electronic expansion valve coil Digital display Display position Error display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact Error trigger Error…

1. The error code corresponds to the following two situations

a. If there is only one electronic expansion valve port on the main control board of the IDU, when an error occurs in the electronic expansion valve coil connected to the EEV port, the error code is b05. b. If there are two electronic expansion valve ports on the main control board of the IDU named…

8.1.12 b12, b14 - Error in 1# electronic expansion valve body, error in 2# electronic expansion valve body Digital display Display position Panel or display box Error display Spot check interface query Error impact Wired controller Error code is not displayed The faulty IDU and other IDUs of the…

8.1.13 b34, b35 - Stall protection for 1# water pump, stall protection on 2# water pump

Digital display Display position Error display Error impact Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger The main control board of the IDU detects the pump rotation speed ≤ 100…

8.1.14 b36 - Water level switch alarm error

Digital display Display position Error display Error impact Error trigger Error recovery Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. The water level switch alarm is triggered when the…

1. The plug attached to the WATER port of the main control board corresponds to the following two cases: a. The factory default of IDUs without a water level switch uses a short-circuit plug to seal the WATER port. b. IDUs with a water level switch use a water level switch plug to seal the WATER…

8.1.15 C11 - Duplicate IDU address code

Digital display Display position Panel or display box Error display Error code and address code are displayed alternately (2) Wired controller Error code and address code flash simultaneously Faulty IDU: The fan continues running, and the EEV is closed. Other IDUs of the same system: The fan…

1. The following table shows the number of addresses and address codes for any IDU with different

★Example: If one IDU is 5 HP and the address code is set to 1, then the query address at the centralized controller side or wired controller side is 1. If one IDU is 20 HP and the address code is set to 5, then this IDU has four address codes, which are 5, 6, 7, and 8, but the query address at the…

8.1.16 C21 - Abnormal communication between IDU and ODU

Digital display Error display Display position Panel, display box, and wired controller Faulty IDU: The fan continues running, and the EEV is closed. Other IDUs of the same system: The fan continues running, the EEV is closed, and error code "A51" is displayed (V6 platform IDU displays the code…

�� If the indoor and outdoor units communicate via HyperLink (M1M2)

Cause 1: M1/M2 cable shortcircuits or cuts off (1) Properly connect the cable Cause 2: The repeater UP and DOWN ports are not connected to the corresponding indoor unit (2) Properly connect the cable Cause 3: The power supply of repeater is cut off Check the power supply of the repeater and restore…

Figure 1 Schematic diagram of HyperLink communication cable connection

Upstream IDU and ODU of repeater 1# (including master ODU) Master ODU IDU 10# IDU 1# Repeater 1# Repeater 2# IDU 11# IDU 20# IDU 21# Downstream IDUs of repeater 1# Upstream IDUs of repeater 2# IDU 30# Downstream IDUs of repeater 2# 1) The UP communication port of 1# repeater is connected to the…

8.1.17 C41 - Abnormal communication between IDU main control board and fan drive board

Digital display Display position Error display Error impact Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger If the main control board of an IDU has lost communication with the fan…

8.1.18 C51 - Abnormal communication between the IDU and wired controller

Note: The error code C51 can be triggered either at the IDU side or at the wired controller side. Digital display Display position Triggered at the wired Triggered at the IDU side controller side The error code "C51" can be Error display queried by entering the spot The error code "C51" is check…

Troubleshooting

MDV V8 Atom Series VRF Indoor Units C51 68 Cause 1: The communication cable material does not meet the anti-interference requirements. Replace the communication cable that meets the anti-interference requirements. Cause 2: Whether the communication cable has a junction or the metal oxidation of the…

8.1.19 C61 - Abnormal communication between the IDU main control board and display control board

Note: The error code C61 can be triggered either at the IDU side or at the panel or display box side. Digital display Display position Triggered at the IDU side Error display Panel, display box, and wired controller Error impact Triggered at the panel or display box side Panel, display box, and…

C61

Cause 1:Unplug the display box or panel communication wire from the main control board of powered indoor unit. Reconnect the communication cable or re-power the IDU Cause 2:Use a wrong port Use correct port by referring to the w7iring diagram Cause 3:The communication wire between the display…

8.1.20 C71 - Abnormal communication between AHU Kit slave unit and master unit

Note: When multiple AHU Kits are connected in parallel, the master AHU Kit (referred to as the master) communicates with the ODU, and the slave AHU Kit (referred to as the slave) communicates with the master control box. Digital display Display position (master) Error display Error impact Error…

8.1.21 C72 - Number of AHU Kits is not the same as the set number

Note: When multiple AHU Kits are connected in parallel, the master AHU Kit (referred to as the master) communicates with the ODU, and the slave AHU Kit (referred to as the slave) communicates with the master control box. Digital display Display position (master) Error display Display box or wired…

8.1.22 C73 - Abnormal communication between the linked humidifying IDU and master IDU

Digital display Display position (master IDU) Error display Panel or display box Wired controller Spot check interface Error code is not query displayed Master IDU: operates normally. Humidifying IDUs: stop. Other IDUs of the same system: operate Error impact normally. ODU of the same system…

8.1.23 C74 - Abnormal communication between the linked FAPU and master IDU (series setting)

Note: 1) The type of FAPU may be HRV, VRF fresh air IDU and so on. 2) Series setting: The air supply side of the linked FAPU is directly connected to the air return side of the master IDU through an air duct. A wired controller is used to set this installation method as a series connection. Digital…

8.1.24 C75 - Communication fault between linked FAPU and master IDU (non-series setting)

Note: 1) The type of FAPU may be HRV, VRF fresh air IDU and so on. 2) Series setting: The linked FAPU and the master IDU are connected to the air supply duct and air return duct respectively and separately. A wired controller is used to set this installation method as a non-series connection.…

8.1.25 C76 - Abnormal communication between the main wired controller and secondary wired controller

Note: The error code C51 can be triggered either at the IDU side or at the wired controller side. Digital display Error display Display position (secondary wired controller) The error code "C76" is displayed only on the secondary wired controller Error impact The faulty IDU and other IDUs of the…

8.1.26 C77, C78 - Abnormal communication between IDU main control board and 1# Expansion Board,

abnormal communication between IDU main control board and 2# Expansion Board Digital display Display position Error display Panel, display box, and wired controller Faulty IDU: The fan continues running, and the EEV is closed. Other IDUs of the same system: Error impact operate normally. ODU of the…

8.1.27 C79 - Abnormal communication between the IDU main control board and Switch module

Digital display Display position Error display Panel, display box, and wired controller Faulty IDU: The fan continues running, and the EEV is closed. Other IDUs of the same system: operate Error impact normally. MDV V8 Atom Series VRF Indoor Units ODU of the same system: operate normally. Error…

8.1.28 C81—The indoor unit is in a power-off state

Digital display Display position Central controller or various types of control terminal Error display software �� The faulty indoor unit and the panels, display boxes, and wired controllers connected to it will stop running, and the central controller or various types of control terminal software…

8.1.29 d16 - Air inlet temperature of IDU is too low in heating mode

Digital display Display position Error display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact MDV V8 Atom Series VRF Indoor Units Error trigger ODU of the same system: operate normally. If the air inlet temperature of the…

8.1.30 d17 - Air inlet temperature of IDU is too high in cooling mode

Digital display Error display Display position Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact Error trigger ODU of the same system: operate normally. If the air inlet temperature of the IDU is higher than the set value…

8.1.31 dE1 - Sensor control board fault

Digital display Display position Error display MDV V8 Atom Series VRF Indoor Units Error impact The faulty IDU and other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger If the main control board of an IDU has lost communication with sensor control…

Digital display Display position Error display Error impact Panel, display box, and wired controller The faulty IDU and other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger If the main control board of an IDU has lost communication with PM2.5…

Digital display Display position Error display Error impact Panel, display box, and wired controller The faulty IDU and other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger If the main control board of an IDU has lost communication with CO2 sensor…

8.1.34 dE4 - Formaldehyde sensor fault

Digital display Display position Error display Error impact Panel, display box, and wired controller The faulty IDU and other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger If the main control board of an IDU has lost communication with…

8.1.35 dE5 - Human Detect sensor fault

Note: The human detector sensor on the smart panel is used to detect the location of the human body. Digital display Display position Error display Error impact MDV V8 Atom Series VRF Indoor Units Error trigger The faulty IDU and other IDUs of the same system: operate normally. ODU of the same…

8.1.36 E21, E24, E81 - T0 (fresh inlet air temperature sensor) short-circuits or cuts off, T1 (IDU return air temperature sensor) short-circuits or cuts off, and TA (outlet air temperature sensor) short-circuits or cuts off Digital display Display position Error display Error impact Panel, display…

8.1.37 EA2 - Return air humidity sensor fault

Digital display Error display Error impact Error trigger Error recovery Display position Panel or display box Wired controller Spot check interface Error code is not query displayed The faulty IDU and other IDUs of the same system: operate normally. ODU of the same system: operate normally. If the…

8.1.38 EC1 - R32 refrigerant leakage sensor fault

Check the R32 refrigerant leakage sensor of faulty IDU If the measured refrigerant saturation pressure at the liquid side or gas side is equal to the standard saturation pressure, there is no refrigerant leak. Then check whether the sensor is damaged or contaminated by foreign materials (such as…

Figure 1 Schematic diagram of the R32 refrigerant leakage detection system

8.1.39 F01, F11, F21 - T2A (heat exchanger liquid pipe temperature sensor) short-circuits or cuts off, T2 (heat exchanger middle temperature sensor) short-circuits or cuts off, and T2B (heat exchanger gas pipe temperature sensor) short-circuits or cuts off Digital display Display position Error…

8.1.40 P31/P34 - Fan drive board AC side overcurrent protection

Digital display Display position Error display Error impact Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. �� P31: The current value detected on the AC side of the fan drive board exceeds the…

8.1.41 P52 - The voltage of the power supply is too low

Digital display Error display Error impact Error trigger Display position Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. �� Power supply voltage is below the programmed protection threshold…

8.1.42 P71 - Main control board EEPROM fault

Digital display Display position Error display Error impact Error trigger Error recovery Possible cause Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. When the master chip cannot receive data…

8.1.43 P72 - IDU display control board EEPROM fault

Digital display Display position Error display Panel or display box The faulty IDU operates normally, and the error code is displayed on the panel or display box only. Other Error impact IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger Error recovery…

8.1.44 U01 - Locked (electronic lock)

Digital display Display position Error display Error impact Panel, display box, and wired controller All IDUs of the same system: stop running, displaying code "U01" ODU of the same system: stops running, displaying code "U01" Error trigger When detecting that the ODU is locked Error recovery…

8.1.45 U11 - Unit model code not set

Digital display Display position Error display Panel, display box, and wired controller 1) The faulty IDU stops running. 2) Other IDUs of the same system: �� If the address for the faulty IDU has been set, other IDUs will operate normally. �� If the address of the faulty IDU was not set, other IDUs…

8.1.46 U12 - Capacity(HP) code not set

Digital display Display position Error display Panel, display box, and wired controller 1) The faulty IDU stops running. 2) Other IDUs of the same system: �� If the address for the faulty IDU has been set, other IDUs will operate normally. Error impact �� If the address of the faulty IDU was not…

8.1.47 U26 - Mismatch between indoor unit model and outdoor unit model

Digital display Display position Error display Panel, display box, and wired controller 1) The faulty IDU stops running. 2) Other IDUs of the same system will operate normally Error impact ODU of the same system: �� If there is one IDU in the system is operating normally, the ODU will operate…

8.1.48 U38 - Address code not detected

Digital display Display position Error display Panel, display box, and wired controller 1) The faulty IDU stops running. 2) Other IDUs of the same system: The fan continues running, the EEV is closed, and ODU error code Error impact "A51" is displayed (V6 platform IDU displays the code "Ed"). ODU of…

8.1.49 J01 - Motor failed more than once

Digital display Display position Error display Error impact Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger If fan control faults have occurred 10 times in 120 min (1) Error…

8.1.50 J1E - IPM (fan module) overcurrent protection

Digital display Display position Error display Error impact Panel or display box Wired controller Spot check interface Error code is not query displayed The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. The fault is triggered if one of…

8.1.51 J11 - Instantaneous overcurrent protection for phase current

Digital display Error display Error impact Error trigger Error recovery Display position Panel or display box Wired controller Spot check interface Error code is not query displayed The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. The…

8.1.52 J3E - Low bus voltage fault

Digital display Display position Panel or display box Wired controller Spot check interface query Error code is not displayed Error display Error impact The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger When the bus voltage…

8.1.53 J31 - High bus voltage fault

Digital display Display position Error display Error impact Panel or display box Wired controller Spot check interface Error code is not query displayed The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger When the bus voltage…

8.1.54 J43 - Phase current sample bias error

Digital display Error display Error impact Display position Panel or display box Wired controller Spot check interface Error code is not query displayed The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger When detecting that…

8.1.55 J45 - Motor and IDU unmatched

Digital display Display position Error display Error impact Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger If the motor code sent by the IDU main control board is not found in the…

8.1.56 J47 - IPM (fan module) and IDU unmatched

Digital display Display position Error display Error impact Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger When detecting that the fan drive board does not match the set value of…

8.1.57 J5E - Motor startup failure

Digital display Error display Error impact Display position Panel or display box Wired controller Spot check interface Error code is not query displayed The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger Motor startup…

8.1.58 J52 - Motor blocking protection

Digital display Display position Error display Error impact Panel or display box Wired controller Spot check interface Error code is not query displayed The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger The motor is…

8.1.59 J55 - Speed control mode setting error

Digital display Display position Error display Error impact Error trigger Error recovery Panel or display box Wired controller Spot check interface Error code is not query displayed The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. The…

Digital display Display position Error display Error impact Panel or display box Wired controller Spot check interface Error code is not query displayed The faulty IDU stops. Other IDUs of the same system: operate normally. ODU of the same system: operate normally. Error trigger When the motor phase…

Appendix 9.1 Temperature Sensor Resistance Characteristics Table 9.1: Indoor temperature sensors resistance characteristics R25=10KΩ±3% B25/50=4100K±3% Resistance Resistance Resistance Temperature Resistance Resistance Resistance (°C) min(kΩ) Normal(kΩ) max(kΩ) (°C) min(kΩ) Normal(kΩ) max(kΩ) -40…

Table 9.1: Indoor temperature sensors resistance characteristics(continues)

Resistance Resistance Resistance Temperature Resistance Resistance Resistance (°C) min(kΩ) Normal(kΩ) max(kΩ) (°C) min(kΩ) Normal(kΩ) max(kΩ) 40 4.926 5.179 5.441 80 1.060 1.166 1.281 41 4.718 4.968 5.225 81 1.025 1.128 1.240 42 4.521 4.766 5.019 82 0.990 1.091 1.201 43 4.333 4.573 4.822 83 0.958…

Table 9.1: Indoor temperature sensors resistance characteristics(continues)

Resistance Resistance Resistance Temperature Resistance Resistance Resistance (°C) min(kΩ) Normal(kΩ) max(kΩ) (°C) min(kΩ) Normal(kΩ) max(kΩ) 120 0.308 0.351 0.400 121 0.299 0.342 0.389 122 0.291 0.332 0.379 123 0.283 0.324 0.370 124 0.276 0.315 0.360 125 0.268 0.307 0.351 126 0.261 0.299 0.342 127…

9.2 Ambient Temperature and Standard Saturation Pressure of R410A

Table 9.2: Ambient Temperature and Standard Saturation Pressure of R410A (saturated vapor state) MDV V8 Atom Series VRF Indoor Units Ambient Saturated gauge Saturated Ambient Saturated gauge Saturated Ambient Saturated gauge Saturated gauge Temperature pressure gauge pressure Temperature pressure…

Table 9.2: Ambient Temperature and Standard Saturation Pressure of R410A (saturated vapor state)-continue 50 2961.7 429.55 57 3487.2 505.78 64 4083.4 592.25 51 3032.8 439.87 58 3567.8 517.47 65 4175 605.54 52 3105.2 450.36 59 3649.9 529.38 66 4268.3 619.07 53 3178.9 461.05 60 3733.5 541.5 67 4363.5…

Table 9.3: Ambient Temperature and Standard Saturation Pressure of R410A (Saturated liquid state) -continue 1739.6 252.31 43 2505.8 363.44 57 3495.4 506.96 30 1787.8 259.3 44 2568.5 372.54 58 3575.9 518.64 31 1837 266.43 45 2632.4 381.8 59 3657.9 530.53 32 1887.1 273.7 46 2697.5 391.24 60 3741.3…

9.3 Ambient Temperature and Standard Saturation Pressure of R32

Table 9.4: Ambient Temperature and Standard Saturation Pressure of R32 Ambient Saturated gauge Saturated Ambient Saturated gauge Saturated Ambient Saturated gauge Saturated gauge Temperature pressure gauge pressure Temperature pressure gauge pressure Temperature pressure pressure (°C) (kPa) (psi)…

Table 9.4: Ambient Temperature and Standard Saturation Pressure of R32 (continue)

3263.1 473.27 59 3746.3 543.36 65 4282.9 621.19 54 3340.1 484.45 60 3831.9 555.77 66 4378 634.97 55 3418.6 495.82 61 3919 568.4 67 4474.7 649 56 3498.4 507.39 62 4007.6 581.25 68 4573.2 663.29 57 3579.6 519.17 63 4097.8 594.33 69 4673.4 677.82 58 3662.2 531.16 64 4189.6 607.64 70 4775.5 692.63 MDV…

MDV

Professional Equipment Midea Group Add.: Midea Headquarters Building, 6 Midea Avenue, Shunde, Foshan, Guangdong, China Postal code: 528311 Note: Product specifications change from time to time as product improvements and developments are released and may vary from those in this document.

Инструкция на Внутренние блоки мини-VRF MDV серии Atom V8

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